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Segment Information - Summary of Products and Services Segments (Detail) - SEK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of operating segments [line items] |  |  |
Total | kr 247,880 | kr 263,351 | kr 271,546
Services [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 97,730 | 104,586 | 97,522
Operating segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 247,880 | 263,351 | 271,546
Operating segments [member] | Products [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 150,150 | 158,765 | 174,024
Operating segments [member] | Services [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 97,730 | 104,586 | 97,522
Networks [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 158,207 | 171,442 | 193,468
Networks [member] | Operating segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 158,207 | 171,442 | 193,468
Networks [member] | Operating segments [member] | Products [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 121,814 | 131,393 | 147,997
Networks [member] | Operating segments [member] | Services [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 36,393 | 40,049 | 45,471
Cloud Software and Services [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 62,635 | 63,630 | 60,524
Cloud Software and Services [Member] | Operating segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 62,635 | 63,630 | 60,524
Cloud Software and Services [Member] | Operating segments [member] | Products [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 22,409 | 21,672 | 21,105
Cloud Software and Services [Member] | Operating segments [member] | Services [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 40,226 | 41,958 | 39,419
Enterprise [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 24,863 | 25,745 | 14,597
Enterprise [Member] | Operating segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 24,863 | 25,745 | 14,597
Enterprise [Member] | Operating segments [member] | Products [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 5,927 | 5,704 | 4,923
Enterprise [Member] | Operating segments [member] | Services [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 18,936 | 20,041 | 9,674
Other [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 2,175 | 2,534 | 2,957
Other [Member] | Operating segments [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 2,175 | 2,534 | 2,957
Other [Member] | Operating segments [member] | Products [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | 0 | (4) | (1)
Other [Member] | Operating segments [member] | Services [member] |  |  |
Disclosure of operating segments [line items] |  |  |
Total | kr 2,175 | kr 2,538 | kr 2,958

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